yes
Yes.
yes
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
Yes. Any rational number divided by another rational number is also rational.
For a number to be divisible by another number it must be at least that number. As 3 is less than 605 it cannot be divisible by 605. Also 3 is not a FACTOR of 605, that is 3 does not divide into 605 without remainder.
No, 605 is not a prime number. It is divisible by 5 and 11, among other factors.
4,840 / 8 = 605
It is a rational number. It can be written as a fraction.
Yes.
yes
Is 12.05 a rational number or irrational number?
1.96 is a rational number
605 is composite. (All whole numbers ending in 5 are composite numbers, except the number 5 itself.).
It is a rational number, as it can be written as a fraction.
Yes, the sum is always rational.
There is no such thing as a number that is both rational and irrational. By definition, every number is either rational or irrational.